Apparatus for lacquering endless metal bands.



No. 858.870. A PATENTED JULY 2, 190m 0.JABGBR. APPARATUS FOR LAGQUBRING ENDLESS METAL BANDS.

APPLICATION FILED AUG. 16, 1906.

UNITED STATES OLIVER JAEGER, OF TRIER, GERMANY.

APPARATUS FOR, LACQUERING ENDLESS METAL BANDS.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed August 16,1906. Serial No. 330,762.

King of Prussia, German Emperor, and a resident of Trier, Germany, have invented certain new and useful Improvements in Apparatus for Lacquering Endless Metal Bands, of which the following is a specification;

The process hitherto employed for lacquering endless metal bands, according to which the bands, after being placed loosely in contact with a lacquering roller are moved backwards and forwards in a twisted position in a frame has not produced a serviceable band, notwithstanding numerous experiments and considerable expenditure of time and material. The reasons for this, which are attributable to the manner in which the process is carried out and the arrangement of the drying apparatus, are chiefly to be found in the circumstance that, in consequence of the flexibility of the metal band, the lacquer is applied without uniformity and in patches, and frequently to the edges of the back of the band, in consequence of which the guide'rollers are smeared with lacquer and cause the band to adhere, whereby again the unimpeded passage of the band is prevented, in consequence of which and the continuous twisting the band tears. In looking after the torn bands and riveting the same, not only the layer of lacquer thereon but also that which is on the bands whichare still intact is wiped off and damaged in large places, owing to the contact with the arms. A further serious disadvantage is that in consequence of the frequent twisting of the bands, the layer of lacquer on the one hand drops off, so that the band shows places which are bare or insufliciently covered, and on the other hand is hindered in drying and consequently is cracked over its whole extent and the vapors of the fresh layers of lacquer prevent the upper layers from becoming peifectly dry, so that with this process it is impossible to obtain an air-dried layer of lacquer and the band coming out of the drying room must consequently be dried for a longer time in the air, before it can be rolled up, apart from the fact that the product thus obtained is unserviceable on account of the faulty layer of lacquer and is very diflicult to sell even as damaged material on account of the lacquer adhering to it.

This invention relates to a process and an apparatus which entirely obviate the said disadvantages and according to practical experiments produces a multiple of endless bands simultaneously, which are lacquered on one side in such a complete manner as to meet every requirement.

In the accompanying drawing one form of the apparatus employed in carrying out the process is illustrated by way of example, Figures 1 and 2 being a longitudinal and a transverse section respectively.

The lacquering apparatus consists of a stove a at the back of which is the fire-place b, which is connected by means of a passage 0 extending through the whole length of the stove, with a flue e that can be closed by a slide d.' In the stove according to the scale on which the work is to be carried on one or more pipes f of any preferred cross-section are built in, in the direction of the passage 0, in such a manner that they are heated throughout by the furnace gases and so as to be more powerfully heated at the back than in the front, and so that the external air has an unimpeded passage through the pipes. tween the pipes f and the passage 0 a bed 9 of fire tiles is arranged, which affords a protection against the direct action of the furnace gases. Likewise a layer 9 of fire tiles is arranged above the pipes, and above this is a layer of sand h, for the purpose of retaining as long as possible the heat transmitted to the pipes.

At both ends of each pipe guide rollers k is resting on bearers i are arranged, by means of which the band B is guided through the pipe in such a manner that without being able to come in contact with the sides of the pipe it passes through the pipe freely suspended, so that excessive heating by the sides of the pipe and a melting of the lacquer are avoided. For the same purpose guide rollers 1 can also be arranged in the pipes, the employment of which is of advantage when in the case of heavy bands there is a danger of the band bulging out downward between the guide rollers 70.

In the front end of the stove is a receptacle m for the lacquer, between which and the stove is a band roller support n, a guide pulley 0 being arranged on the other side of the receptacle 'm.

The receptacle for the'lacquer is furnished with a take-up roller p, which takes the lacquer out of the receptacle and a delivery roller q adjustable thereto, which receives the lacquer from the roller 0 and applies it to the band B. Above the delivering roller q is a suitable number of pressing rollers 1", under which the band is passed so that the band guided over the delivering roller is prevented from springing off the same, without being pressed on to the roller.

At the back of the stove a band winding drum .9 for the finished band is arranged at such a distance from the stove that from the time the band leaves the stove until it reaches the drum it is carried through the space -t which is not heated. Each of the pipes f is furnished with a suitable number of vent pipes u for carrying off. the lacquer vapors and with a pyrometer a). The arrangement and number of the lacquer receptacles and of the devices for winding and unwinding the bands depends upon the number of the pipes f provided or employed.

The lacquering process carried out with the abovedescribed apparatus is as followsz-When the stove has been sufficiently heated and the support n charged with a band roll w, the band B is guided under the pressing rollers r and over the delivering roller q, the rollers 1 preventing the flexible band from coming into abrupt contact with the roller q as happens in the existing process, and insuring a uniform delivery of the lacquer on to the band, whilst the quantity of lacquer delivered is regulated by adjustment of the delivering roller q in relation to the take-up roller p. The band thus lacquered is carried with the lacquered side upwards over the guide pulleys 0 and the guide roller is into the pipe f and over the guide roller is out of the pipe and after it has passed the space t, is wound on the winding drum. The arrangement of the receptacle m for the lacquer between the guide pulley 0 and the band roller support n enables the band to be so conveyed through the stove that, without altering its position, it comes in contact with the guiding medium 0 k kl Z with its free underside, and passes through' the stove or the pipe with the lacquered side on top, whereby on the one hand, any dripping of the lacquer and thereby a smearing of the guiding medium and, on the other hand, any tearing of the layer of lacquer is entirely prevented. The band passes through the pipe in the opposite direction to that in which the pipe is heated by the furnace gases and as the heating of the pipe in the front is less powerful than at the back, is first conveyed gradually to the largest heating zone. Hereby the considerable advantage is obtained that the layer of lacquer is subjected to a gradual drying and does not contract and become patchy as is the case in the existing process, owing to too rapid drying. In consequence of the heat generated in the drying passage f and the arrangement whereby this is open at both ends, the automatic passing of a current of cold air through the drying passage is likewise insured, the effect of which is that the vapors generated during the drying are forced out of the passage and escape through the discharge pipe 'Lt. The consequence of this carrying off of the vapor is that a single passage of the hand through the stove is suificient for completely drying the layer of lacquer on the band.

In order to relieve the band of the heat and thereby to make it at once suitable for being wound on the disk 8, it is conveyed through a space t which is not heated.

When operations are conducted on a large scale the stove may be constructed in stages as a step stove with several fire places, in which case the receptacle for the lacquer as well as the band pulleys are set up on stages in front of and behind the stove.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:-

1. An apparatus for lacquering a multiple of endless metal bands simultaneously and separately each on one side during one continuous operation comprising, a dry ing even, a multiple of drying tubes open at both ends arranged horizontally therein and parallel to each other, guiding rollers at each end and within said drying tubes, a band supplying roller for each tube, means for applying the lacquer, guiding pulleys conveying the bands with the lacquered surface 011 top, tire tiles on the top and bottom of the drying tubes-and lacquer vapor discharge pipes, and a fire place with heat ducts on the side of the even where the coated bands leave same.

2, In an apparatus for laequering a multiple ot. endless metal bands, simultaneously on one side, during one continuous operation a drying oven comprising a multiple of drying tubes open at both ends horizontally arranged therein, guiding rollers at each end and within said dr v ing tubes, tire tiles on top and bottom of said drying tubes and lacquer vapor discharge pipes, a tire-place with heating passages at one side of the oven opposite to where the bands enter so that same are subjected to gradually increasing heat.

Signed at Cologne, Germany this 31st day of August. 1906.

OLIVER .lAl ltll lll.

Witnesses Bussin F. DUNLAI, Louis VANnonN. 

